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If the hold takes longer than anticipated, check back with the caller periodically, so they don’t feel as though they have been abandoned.

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与直齿轮传动相比,斜齿轮传动更为平稳,重合度更大。

轮系中若含有圆锥齿轮、蜗轮蜗杆或齿轮齿条,则各轮转向只能用(画箭头 )的方法表示。

Food is the paramount ________________of people.

混凝土的强度等级按混凝土立方体抗压强度标准值fcu,k确定,用符号C表示,单位为N/m2。

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